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UPDATE 2-UK blue chips hit 10-month high as bank and energy stocks gain

(For a Reuters live blog on U.S., UK and European stock markets, click LIVE/ or type LIVE/ in a news window)

* FTSE 100 highest since late February 2020

* Oil prices surge to 11-month highs

* Food retailer Greggs says sales decline slowed

* FTSE 100 up 3.5%, FTSE 250 up 1.2% (Updates to market close, adds analyst comments)

Jan 6 (Reuters) - Britain’s blue-chip FTSE 100 index ended at its highest since February on Wednesday, led by banking and energy stocks as investors bet on more U.S. stimulus and crude oil prices jumped after Saudi Arabia agreed to cut more output than expected.

The exporter-heavy FTSE 100 index rose 3.5%, clocking its third consecutive session of gains. Lenders HSBC , Barclays and Standard Chartered provided the biggest boost with gains between 8% and 9.6%.

The mid-cap FTSE 250 index was up 1.2%.

Investors globally eyed a Democratic sweep of the U.S. Senate that could result in a bigger fiscal stimulus.

“Once we get past the U.S. political situation, COVID is going to be increasingly front and centre,” said Craig Erlam, senior market analyst at OANDA.

Oil heavyweights BP and Royal Dutch Shell rose almost 6.5% as crude prices gained after Saudi Arabia said it would make additional, voluntary oil output cuts of 1 million barrels per day in February and March.

Investors also looked past the near-term effects of the new lockdowns imposed to curb a surge in coronavirus cases to bet on a quicker economic recovery.

“There is huge liquidity being infused by the central bank which will continue to support markets in addition to an extremely positive 2021 growth outlook,” said James Gutman, head of investment portfolios at Dolfin Financial.

British stocks began the year on a positive note, boosted by fresh stimulus, and the government’s aim to vaccinate around 14 million of the most vulnerable against the COVID-19 virus by mid-February.

The world’s largest exhibitions group Informa Plc rose 6.4% even after forecasting a more than 70% plunge in its 2020 profit.

British baker and fast food retailer Greggs closed higher at 7.8% after it said sales decline had slowed, but warned it does not expect profit to return to pre-pandemic levels until 2022. (Reporting by Shashank Nayar and Shivani Kumaresan in Bengaluru; Editing by Arun Koyyur and Nick Zieminski)

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